Ambiguous refernce to mxml:HTTPService

In Flex Builder 3, I get "Can not resolve a multiname reference unambiguously." when I include:

<mx:HTTPService
id="data"
method="POST"
url="data.php">
</mx:HTTPService>

The error text is:

Can not resolve a multiname reference unambiguously. mx.rpc.http.mxml:HTTPService (from /Applications/Adobe Flex Builder 3/sdks/3.0.0/frameworks/libs/rpc.swc(mx/rpc/http/mxml/HTTPService)) and mx.rpc.http:HTTPService (from /Applications/Adobe Flex Builder 3/sdks/3.0.0/frameworks/libs/rpc.swc(mx/rpc/http/HTTPService)) are available. FeralHiveProject/src BeeLine.mxml Unknown 1212335979836 469

Can not resolve a multiname reference unambiguously. mx.rpc.http.mxml:HTTPService (from /Applications/Adobe Flex Builder 3/sdks/3.0.0/frameworks/libs/rpc.swc(mx/rpc/http/mxml/HTTPService)) and mx.rpc.http:HTTPService (from /Applications/Adobe Flex Builder 3/sdks/3.0.0/frameworks/libs/rpc.swc(mx/rpc/http/HTTPService)) are available. FeralHiveProject/src BeeLine.mxml Unknown 1212335979838 470


Seems FB is confused between mx.rpc.http:HTTPService and mx.rpc.http.mxml:HTTPService